<template>
  <nav>
    <ul class="pagination">
      <li :class="{'disabled': current == 1}"><a href="javascript:;" @click="setCurrent(current - 1)"> « </a></li>
      <li :class="{'disabled': current == 1}"><a href="javascript:;" @click="setCurrent(1)"> {{$t('myAdd.paginations.homePage')}} </a></li>
      <li v-for="p in grouplist" :class="{'active': current == p.val}"><a href="javascript:;"
                                                                          @click="setCurrent(p.val)"> {{ p.text }} </a>
      </li>
      <li :class="{'disabled': current == page}"><a href="javascript:;" @click="setCurrent(page)"> {{$t('myAdd.paginations.lastPage')}} </a></li>
      <li :class="{'disabled': current == page}"><a href="javascript:;" @click="setCurrent(current + 1)"> »</a></li>
    </ul>
  </nav>
</template>

<script>
  export default{
    data () {
      return {
        current: this.currentPage
      }
    },
    props: {
      total: { // 数据总条数
        type: Number,
        default: 0
      },
      display: { // 每页显示条数
        type: Number,
        default: 10
      },
      currentPage: { // 当前页码
        type: Number,
        default: 1
      },
      pagegroup: { // 分页条数
        type: Number,
        default: 3,
        coerce: function (v) {
          v = v > 0 ? v : 3
          return v % 2 === 1 ? v : v + 1
        }
      }
    },
    computed: {
      page: function () { // 总页数
        return Math.ceil(this.total / this.display)
      },
      grouplist: function () { // 获取分页页码
        let len = this.page
        let temp = []
        let list = []
        let count = Math.floor(this.pagegroup / 2)
        let center = this.current
        if (len <= this.pagegroup) {
          while (len--) {
            temp.push({text: this.page - len, val: this.page - len})
          }
          return temp
        }
        while (len--) {
          temp.push(this.page - len)
        }

        let idx = temp.indexOf(center)
        if (idx < count)center = center + count - idx
        if (this.current > this.page - count) {
          center = this.page - count
        }
        temp = temp.splice(center - count - 1, this.pagegroup)
        do {
          let t = temp.shift()
          list.push({
            text: t,
            val: t
          })
        } while (temp.length)
        if (this.page > this.pagegroup) {
          if (this.current > count + 1) list.unshift({text: '...', val: list[0].val - 1})
          if (this.current < this.page - count) list.push({text: '...', val: list[list.length - 1].val + 1})
        }
        return list
      }
    },
    methods: {
      setCurrent: function (idx) {
        if (this.current !== idx && idx > 0 && idx < this.page + 1) {
          this.current = idx
          this.$emit('pagechange', this.current)
        }
      }
    }
  }
</script>

<style lang="stylus" scoped>
  .pagination {
    overflow: hidden;
    display: table;
    margin: 0 auto;
    /*width: 100%;*/
    height: 50px;
    li {
      float: left;
      height: 30px;
      border-radius: 5px;
      margin: 3px;
      color: #666;
      &
      :hover {
        background: #233F65
        a {
          color: #fff;
        }
      }
      a {
        display: block;
        width: 30px;
        height: 30px;
        text-align: center;
        line-height: 30px;
        font-size: 12px;
        border-radius: 5px;
        text-decoration: none
      }
    }
    .active {
      background: #182540;
      a {
        color: #fff;
      }
    }
  }
</style>
